Bike started, but only one side smoking

[NYSingh]

In addition to what everyone else said:

• put the air filter on - it's gonna run lean if you run the bike without it (unless you've up-jetted to compensate)
• either way, do a leak down like suggested (the way the revs were increasing in your video sounds like an air leak)
• did you check timing?
• are you getting spark on the left side if you rotate by hand (take plug out of cylinder but keep it in the boot, make sure it is rested against bare metal to properly ground, turn key and ignition switch, then rotate the crank slowly using the kick start or wrench on the left-side crankshaft bolt)?
• did you try swapping coils?